@RobertIN, I do understand that you are looking for an entry level traditional muzzleloading rifle that conforms to the specifications of these entry level rifles and not a rifle that is a close version of a rifle built by Sam Hawken of John Gemmer. After all the copyright for naming has long since been passed. So, stick with the specifications of a relatively short barreled, 45 or 50 caliber rifle with a percussion lock and double set triggers. As stated by many of us, the brand name is less important at this stage of the search and your stated level of experience than the condition of the bore. For the entry level rifles, I recommend a percussion lock as these are less difficult to use proficiently by someone new to traditional muzzleloading and there is little benefit to spending extra money for a replacement percussion lock. The set triggers are acceptable but not great. I do prefer a barrel with a snailed breech to the drum and nipple as the snail is stronger (pay no attention to the what is called the "cleanout screw", it's not). Both will require some learning to keep the chambered breeches clean and the flash channels clear. There's plenty of threads here on the Forum on that topic. Some useful information can be found there.
When you have a rifle in your hands for inspection, be prepared to run a lubricated patch down the bore. You are looking for a load at the breech and if rust is present. Be aware that it is likely that the patch will pull out some very brown rust like material. It may be rust or oxidized Bore Butter (or other lubricant) left in the bore. With a bore light look for pitting on the lands or in the grooves. Ask what powder has been used. Pyrodex fouling has been well documented to cause irreparable harm to bores. If the rifle has been properly cleaned and rust inhibiting oils used, the bore should be fine although the patch pulling out the old oils will be a nasty brown color. Be very leery if the owner won't allow you to use a bore light or run a patch.
Enjoy the process of searching for a new to you rifle and learning of the joys tthat can come from using traditional muzzleloading rifles.